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Steffo 2021-06-13 20:42:02 +02:00
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GNU LESSER GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
This version of the GNU Lesser General Public License incorporates
the terms and conditions of version 3 of the GNU General Public
License, supplemented by the additional permissions listed below.
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As used herein, "this License" refers to version 3 of the GNU Lesser
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General Public License.
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# `async-chain`
A coroutine builder
## What?
Have you ever felt that the `await` syntax in Python was a bit clunky when chaining multiple methods together?
```python
async def on_message(event):
message = await event.get_message()
author = await message.get_author()
await author.send_message("Hello world!")
```
Or even worse:
```python
async def on_message(event):
(await (await (await event.get_message()).get_author()).send_message("Hello world!"))
```
`async-chain` is here to solve your problem!
```python
async def on_message(event):
await event.get_message().get_author().send_message("Hello world!")
```
## How?
First, install `async_chain` with your favorite package manager:
```console
$ pip install async_chain
```
```console
$ pipenv install async_chain
```
```console
$ poetry add async_chain
```
Then, add the `@async_chain.method` decorator to any async method you wish to make chainable, and the problem will be
magically solved!
```python
import async_chain
class MyEvent:
@async_chain.method
async def get_message(self):
...
```

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from .decorators import method_deco as method

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import inspect
import typing as t
import abc
class Chain(metaclass=abc.ABCMeta):
def __init__(self):
pass
def __getattr__(self, item):
return ChainGetAttr(previous=self, item=item)
def __getitem__(self, item):
return ChainGetItem(previous=self, item=item)
def __call__(self, *args, **kwargs):
return ChainCall(previous=self, args=args, kwargs=kwargs)
def __await__(self):
return self.__evaluate__().__await__()
@abc.abstractmethod
def __repr__(self):
raise NotImplementedError()
@abc.abstractmethod
def __display__(self):
raise NotImplementedError()
@abc.abstractmethod
async def __evaluate__(self):
raise NotImplementedError()
class ChainStart(Chain):
def __init__(self, start: t.Any):
super().__init__()
self.__start__: t.Any = start
def __repr__(self):
return f"<Chain {self.__display__()}>"
def __display__(self):
return f"{self.__start__!r}"
async def __evaluate__(self):
return self.__start__
class ChainNode(Chain, metaclass=abc.ABCMeta):
def __init__(self, previous: Chain):
super().__init__()
self.__previous__: Chain = previous
def __repr__(self):
return f"<Chain {self.__display__()}>"
class ChainGetAttr(ChainNode):
def __init__(self, previous: Chain, item: str):
super().__init__(previous=previous)
self._item: str = item
def __display__(self):
return f"{self.__previous__.__display__()}.{self._item!s}"
async def __evaluate__(self):
previous = await self.__previous__.__evaluate__()
current = getattr(previous, self._item)
if inspect.isawaitable(current):
return await current
else:
return current
class ChainGetItem(ChainNode):
def __init__(self, previous: Chain, item: t.Any):
super().__init__(previous=previous)
self._item: t.Any = item
def __display__(self):
return f"{self.__previous__.__display__()}[{self._item!r}]"
async def __evaluate__(self):
previous = await self.__previous__.__evaluate__()
current = previous[self._item]
if inspect.isawaitable(current):
return await current
else:
return current
class ChainCall(ChainNode):
def __init__(self, previous: Chain, args, kwargs):
super().__init__(previous=previous)
self._args = args
self._kwargs = kwargs
def __display__(self):
args = map(lambda a: f"{a!r}", self._args)
kwargs = map(lambda k, v: f"{k!s}={v!r}", self._kwargs)
allargs = ", ".join([*args, *kwargs])
return f"{self.__previous__.__display__()}({allargs})"
async def __evaluate__(self):
previous = await self.__previous__.__evaluate__()
current = previous(*self._args, **self._kwargs)
if inspect.isawaitable(current):
return await current
else:
return current

20
async_chain/decorators.py Normal file
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import functools
from .chain import ChainStart
class FunctionWrapper:
def __init__(self, func):
self._func = func
def __repr__(self):
return self._func.__name__
def __call__(self, *args, **kwargs):
return self._func(*args, **kwargs)
def method_deco(func):
@functools.wraps(func)
def decorated(*args, **kwargs):
return ChainStart(start=FunctionWrapper(func))(*args, **kwargs)
return decorated

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import pytest
import asyncio
import async_chain
pytestmark = pytest.mark.asyncio
class ExampleClass:
def __init__(self, value):
self.value = value
def __repr__(self):
return f"Example(value={self.value})"
@async_chain.method
async def plus(self, n):
await asyncio.sleep(0)
return self.__class__(self.value + n)
@property
@async_chain.method
async def incremented(self):
await asyncio.sleep(0)
return self.__class__(self.value + 1)
async def test_class_creation():
example = ExampleClass(0)
assert example
@pytest.fixture()
def example():
return ExampleClass(0)
async def test_method_existence(example):
assert hasattr(example, "plus")
assert hasattr(example, "minus")
assert hasattr(example, "incremented")
assert hasattr(example, "decremented")
async def test_chain_single_property(example):
one = await example.incremented
assert isinstance(one, ExampleClass)
assert one.value == 1
async def test_chain_multiple_properties(example):
three = await example.incremented.incremented.incremented
assert isinstance(three, ExampleClass)
assert three.value == 3
async def test_chain_single_method(example):
one = await example.plus(1)
assert isinstance(one, ExampleClass)
assert one.value == 1
async def test_chain_multiple_methods(example):
three = await example.plus(1).plus(1).plus(1)
assert isinstance(three, ExampleClass)
assert three.value == 3

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poetry.lock generated Normal file
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category = "dev"
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pluggy = ">=0.12,<1.0.0a1"
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toml = "*"
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17
pyproject.toml Normal file
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[tool.poetry]
name = "async-chain"
version = "0.1.0"
description = ""
authors = ["Stefano Pigozzi <me@steffo.eu>"]
license = "LGPL-3.0-or-later"
[tool.poetry.dependencies]
python = "^3.9"
[tool.poetry.dev-dependencies]
pytest = "^6.2.4"
pytest-asyncio = "^0.15.1"
[build-system]
requires = ["poetry-core>=1.0.0"]
build-backend = "poetry.core.masonry.api"